Twice in the last three years my AC compressor has been struck by lightning.  I live on a hill and lightning strikes seem to be a problem.  Along with my AC (a circuit board inside the AC compressor metal box) my sprinkler system has been struck and traveled up the control lines to the control box in my garage.  There have been at least 5 lightning strikes on sprinkler systems on my hill over several years.  Twice on me and three others that I know of.  I have protected the control box with fuses on the control lines going into the control box.  The AT&T lines are also affected and I have put a surge protector on the phone line.  I have a whole house surge protector to prevent lightning from coming in through the power lines.  The last thing I need protected is the circuit boards in the compressor where the lightning enters and blows the circuit board in the compressor as well as a circuit board inside the house.  I only have about 6 inches of dirt in my yard then it is solid limestone after that.  I have searched online and had very little success with only suggestions of grounding the compressor (not easy to do with the ground I have) and building a Faraday cage around the compressor.  Lightning rods would also be difficult due to the solid rock this neighborhood is built on.  I have suggested that a "neighborhood lightning rod" might be a good thing to the HOA president and got nothing but a quizzical  expression.  I want to stop the next strike from causing damage to my AC which is the most expensive items to fix in the last two strikes